
export default{
  namespaced:true,
  data(){
    return {}
  },
  state:()=>({
    cart:JSON.parse(uni.getStorageSync('cart')||'[]'),
  }),
  //模块的mutations方法
  mutations:{
    addToCart(state,goods){
      const findResult = state.cart.find((x)=>x.goods_id===goods.goods_id)
      if(!findResult){
         state.cart.push(goods)
      }
      else{
        findResult.goods_count++
      } 
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    updateGoodsState(state,goods){
      const findResult =state.cart.find(x=>x.goods_id===goods.goods_id)
      if(findResult){
        findResult.goods_state=goods.goods_state
        this.commit('m_cart/saveToStorage')
      }
    },
    updateGoodsCount(state,goods){
      const findResult = state.cart.find(x=>x.goods_id===goods.goods_id) 
      if(findResult)
      findResult.goods_count=goods.goods_count
      this.commit('m_cart/saveToStorage')
    }, 
    removeGoodsById(state,goods_id){
      state.cart=state.cart.filter(x=>x.goods_id!==goods_id)
        this.commit('m_cart/saveToStorage')
        
      },
      //更新所有商品的勾选状态
      updateAllGoodsState(state,newState){
        state.cart.forEach(x=>x.goods_state=newState)
        this.commit('m_cart/saveToStorage')
      },
     
    
  },
  //模块的getters属性
  getters:{ 
    checkedGoodsAmount(state){
        return state.cart.filter(x=>x.goods_state)
        .reduce((total,item)=>total+=item.goods_count*item.goods_price,0)
        .toFixed(2)
      },
    //统计购物车中商品的总数量
    total(state){
      let c=0
      state.cart.forEach(goods=>c+=goods.goods_count)
      return c
    },
    checkedCount(state){ 
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count,0)
    }
  }
  
  
}